Drafting-machine aligning tool



Sept, 9, 1947. I A. F. EMRICH 2,425,991

I DRAFTING-MACHINE ALIGNING TOOL Filed July 4, 1945 JNVENTOR. ALBERT F. EMRICH.

ATTORNE Y.

Patented Sept. 9, 1947 UNITED STATES PATENT OFFICE DRAFTING-MACHINE ALIGNINGVTOOL 7 Albert F. Emrich, Valley Stream, N. Y. Application July 4, 1945, Serial No. 603,247 I (Cl. 33-181) (Granted under the act of March 3, 1883,as

2 Claims.

7 Q 1 V This invention relates to a tool for aligning parts of a universal drafting machine.

An object of this invention is to provide a simple tool that can be used to align the deadlines of a universal drafting machine with respect to each other and with respect to the scale arm of the machine.

Another object is to provide a tool which is of simple construction and of small size which can be used by unskilled personnel to align the deadlines and scale arm of a universal drafting machine.

Further objects and advantages of this invention, as well as its construction, arrangement and operation, will be apparent from the following description and claims in connection with the accompanying drawing, in which Fig. 1 is a top plan view of a conventional type of universal drafting machine, omitting portions unessential to the disclosure of this invention, and showing the aligning tool in use,

Fig. 2 is a top plan view of the aligning tool, and

Fig. 3 is a front view in elevation of the aligning tool.

Fig. 1 shows portions of a universal drafting machine essential to the understanding of this invention and the aligning tool in use. On the screw or mast ID of the drafting machine are rotatably mounted the compass rose II, outer ring I2, and disc I3, disc I3 being secured to mast II] by means of nut I4. Scale arm I5 which mounts a straight edge or scale 40 is made integral with or permanently fixed to the mast I0.

The deadlines l6 are secured to disc I3 by means of screws I! and have indicators I8 for use in conjunction with the graduations of the compass rose II.

Since scale arm I5 is integral with mast ID and since disc I3 is securely attached to mast I by nut I4, movement of the scale arm I and scale 40 causes deadlines It to move over compass rose II and permit setting of indicators I8 as desired. It is, of course, desirable at all times to have the indicators I8 and the centerline I9 of the scale arm I5 in alignment. This is clearly illustrated when the universal drafting machine is used in navigation.

When used for this purpose the navigator orients the compass rose I I (clamping it in position by means not illustrated) so that zero is toward the top of his work table, zero indicating north, 90 degrees indicating east, 180 degrees indicating south, and 270 degrees indicating west.

With the indicators I8 at 90 degrees and 270 amended April 30, 1928; 370 0., G. 757).

degrees and the scale I6 in line, the latitude lines of the chart are-brought into'alignment with the edge of scale 40, and the chart tacked in place. The graduations of the compass rose II now are 1. in agreement with directions on the chart and the machine is ready for drawing course lines, bearing lines, and other necessary lines.

With usage and loosening of nut I4, it has been found that indicators I8 get out of line with each other and quite frequently with respect to the center line I9 of scale arm I5. To remedy this condition quickly the nut I4 is loosened, freeing disc I3, the aligning tool 20 used to align indicators I8 and center line I9, and the nut I4 tightened again with the parts in proper alignment. The screws I! may be loosened, too, in the event the indicators I8 are out of alignment with respect to each other, and subsequently tightened again after proper realignment.

The aligning tool 20 is essentially a narrow strip of rigid material, preferably metal, and has a flat portion 2I from which descend two inclined portions 22 and 23. Extending from the inclined portion 22, is a short flat portion 24 which has a beveled edge 25 and indicator 26. Extending from'the inclined portion 23 is a fiat portion 21 which has a cut out 28, one side of which is beveled at 29, and has the indicator 30.

Extending from the flat portion 2! is another inclined portion 3| which is continued by short flat portion 32 which has a beveled edge 33 and indicator 34. The indicators 26, 30 and 34 are in alignment, necessarily, for the proper functioning of the tool. It is to be noted, too, that the configuration illustrated and described permits the tool to clear protruding parts of the drafting machine and permits the indicators to be placed contiguously to the parts to be aligned.

Centrally located below the flat portion 2| is a circular boss 35 having a circular recess 36.

In operation the recess 36 of boss 35 is placed on the mast I0 rotatably to support the tool, the indicators 26 and 30 are used to align the indicators I 8 and the indicator 34 is used to align the centerline I9. With the indicators I8 and the centerline I9 in alignment, the movable parts are screwed into fixed position and the device is ready for use.

It is to be understood that various modifications and changes may be made in this invention without departing from the spirit and scope thereof as set forth in the appended claims.

The invention described herein may be manufactured and used by or for the Government of the United States of America for govermnental portion, an indicator on said end portion, asset-- ond inclined portion connected to said flat portion, a second flat portion connected to said second inclined portion, a cut out in said second fiat portion, an indicator on the periphery of; saidicnt out, a third inclined portion connectedto said second flat portion, a flattened endportion on said third inclined portion, and an indicatorxonisaid last named end portion. r

2. An aligning tool comprising an elongated member, a flat portion on said elongated member,

a downwardly inclined member contiguous tosaidl flat portion, a flat end portion on said downwardly inclined member, albeveled edge on the extremity of said flat end portion, an indicator on saidrbev eled edge, a second downwardly inclinedmember contiguous to said fiatportion, a second flat portion contiguous to said second inclined member, a

cut out in saidsecond'flat portion, a berelededge on the periphery of said out out, an indicator on S d beve ed ed e, a third downwardly inclined member contiguous to said second flat portion, a fiat end portion on said third downwardly inclined member, a beveled edge on said last named end portion, an indicator on said beveled edge, all said indicators being in the sameplane, a boss below said first named fiat portiomand a recess in said bos".

b ALBERT F. EMRICH.

I REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 340,883: Kells Apr. 27, 1886 944,462 Osborne Dec. 28, 1909 1,514,452 Frederickson et al. Nov. 4, 1924 FOREIGN PATENTS Number Country Date 846,691 France June 12, 1939 1,524 Great Britain 1905 

